Go to WHM, login as root and click on Tweak Settings, then you should ensure that both the Ioncube loader is selected for the backend copy of PHP. Save changes.

Now go here:WHM -> Add-Ons (Plugins on v11.x or higher) -> Fantastico De Luxe WHM Admin (scroll down the left menu).

Upon loading, Fantastico De Luxe WHM Admin will auto-update your existing installation (if existing). All admin files (masterfiles, tarballs, settings etc) will be moved to or created at /var/netenberg.